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A cattle crush (in UK, New Zealand, Ireland and Australia), squeeze chute (North America),〔(Cattle handling equipment )〕〔(SWEEPS & ALLEYS )〕 standing stock, or simply stock (North America, Ireland) is a strongly built stall or cage for holding cattle, horses, or other livestock safely while they are examined, marked, or given veterinary treatment. Cows may be made to suckle calves in a crush. For the safety of the animal and the people attending it, a close-fitting crush may be used to ensure the animal stands "stock still". The overall purpose of a crush is to hold an animal still to minimise the risk of injury to both the animal and the operator while work on the animal is performed. ==Construction== Crushes were traditionally manufactured from wood; this, however, was prone to deterioration from the elements over time, as well as having the potential to splinter and cause injury to the animal. In recent years, most budget-quality crushes have been built using standard heavy steel pipe that is welded together, while superior quality crushes are now manufactured using doubly - symmetric oval tubing for increasing bending strength, bruise minimisation and stiffness in stockyard applications. In Australia, the steel itself should ideally be manufactured to High Tensile Grade 350LO - 450LO and conform to Australian Standards AS 1163 for structural steel.〔(Cattle Crush Steel ) Retrieved on 4 January 2010〕 Cattle crushes may be fully fixed or mobile; however, most crushes are best classified as semipermanent, being potentially movable but designed to primarily stay in one place. A cattle crush is typically linked to a ''cattle race'' (also known as an ''alley''). The front end has a ''head bail'' (or ''neck yoke'' or ''head gate'') to catch the animal and may have a baulk gate that swings aside to assist in catching the beast. The bail is often adjustable to accommodate animals of different sizes. This bail may incorporate a chin or neck bar to hold the animal's head still. A side lever operates the head bail to capture the animals, with the better types having a rear drop-away safety lever for easier movement of the cattle into the bail. Usually, smaller animals can walk through the head bails incorporated in crushes.〔Doyle, Philip W., Beef Cattle Yards, NSW Dept. of Agriculture, 1979〕 Lower side panels and/or gates of sheet metal, timber or conveyor belting are used in some cases to ensure animals’ legs do not get caught and reduce the likelihood of operator injury.〔 At least one side gate is usually split to allow access to various parts of the animal being held, as well as providing access to feed a calf, amongst other things. A ''squeeze crush'' has a manual or hydraulic mechanism to squeeze the animal from the sides, immobilizing the animal while keeping bruising to a minimum. A sliding entrance gate, operated from the side of the crush, is set a few feet behind the captured animal to allow for clearance and prevent other animals entering. Crushes will, in many cases, have a single or split veterinary gate that swings behind the animal to improve operator safety, while preventing the animal from moving backwards by a horizontal ''rump bar'' inserted just behind its haunches into one of a series of slots. If this arrangement is absent, a palpation cage can be added to the crush for veterinary use when artificial insemination or pregnancy testing is being performed, or for other uses.〔(CHUTES and ACCESSORIES ) Retrieved on 16 April 2009〕 Older crushes can also be found to have a guillotine gate that is also operated from the side via rope or chain where the gate is raised up for the animal to go under upon entering the crush, and then let down behind the animal. A crush is a permanent fixture in slaughterhouses, because the animal is carried on a conveyor restrainer under its belly, with its legs dangling in a slot on either side. Carried in this manner, the animal is unable to move either forward or backward by its own volition.〔(Conveyor Restrainer ) Retrieved on 4 September 2008〕 Some mobile crushes are equipped with a set of wheels so they can be towed from yard to yard. A few of these portable crushes are built so the crush may also be used as a portable loading ramp. A mobile crush must incorporate a strong floor, to prevent the animal moving it by walking along the ground. Crushes vary in sophistication, according to requirements and cost. The simplest are just a part of a cattle race (alley) with a suitable head bail. More complex ones incorporate features such as automatic catching systems, hatches (to gain access to various parts of the animal), winches (to raise the feet or the whole animal), constricting sides to hold the animal firmly (normal in North American slaughterhouses), a rocking floor to prevent kicking〔(The "Livestock Controller" crush, designed to prevent kicking )〕 or a weighing mechanism. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Livestock crush」の詳細全文を読む スポンサード リンク
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